<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <title>返回主机名对应的 IPv4地址。</title>
 </head>
 <body class="docs"><div id="layout">
  <div id="layout-content"><div id="function.gethostbyname" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">gethostbyname</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">gethostbyname</span> &mdash; <span class="dc-title">
   返回主机名对应的 IPv4地址。
  </span></p>

 </div>

 <div class="refsect1 description" id="refsect1-function.gethostbyname-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>gethostbyname</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$hostname</code></span>
   ) : <span class="type">string</span></div>

  <p class="para rdfs-comment">
   返回主机名 <code class="parameter">hostname</code> 对应的 IPv4 互联网地址。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.gethostbyname-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">hostname</code></dt>

     <dd>

      <p class="para">
       主机名
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.gethostbyname-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 IPv4 地址，失败时原封不动返回 <code class="parameter">hostname</code> 字符串。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.gethostbyname-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-5485">
    <p><strong>Example #1 简单的 <span class="function"><strong>gethostbyname()</strong></span> 例子</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$ip&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">gethostbyname</span><span style="color: #007700">(</span><span style="color: #DD0000">'www.example.com'</span><span style="color: #007700">);<br /><br />echo&nbsp;</span><span style="color: #0000BB">$ip</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.gethostbyname-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="gethostbyaddr.html" class="function" rel="rdfs-seeAlso">gethostbyaddr()</a> - 获取指定的IP地址对应的主机名</span></li>
    <li class="member"><span class="function"><a href="gethostbynamel.html" class="function" rel="rdfs-seeAlso">gethostbynamel()</a> - 获取互联网主机名对应的 IPv4 地址列表</span></li>
    <li class="member"><span class="function"><a href="inet_pton.html" class="function" rel="rdfs-seeAlso">inet_pton()</a> - Converts a human readable IP address to its packed in_addr representation</span></li>
    <li class="member"><span class="function"><a href="inet_ntop.html" class="function" rel="rdfs-seeAlso">inet_ntop()</a> - Converts a packed internet address to a human readable representation</span></li>
   </ul>
  </p>
 </div>


</div></div></div></body></html>